I came up with a couple of ideas for some brackets that would allow you to make much stronger connections to c-beam and other projects. Hopefully the store can look at these and perhaps get their suppliers to make them. The one on the left is basically the same as the 4 hole brackets, but it's twice as high and has 8 holes. The next 2 are variations on the cast corner bracket, also an 8 hole 40x40, and a 4 hole 20x40. I would love to see these in the store... And I have attached the sketchup file as Mark Carew requested.